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I am not quite sure if this is grammatical or not.
I used 快得多 to describe speed of development is faster.
You are already correct! Some alternatives, you can also use Adj.+多了 or Adj.+很多 to express the degree is high. So, all of these sentences have the same meaning.
Yes, you are right,but still we could say in other ways, see the change in degree.
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